TiO2晶须/液体硅橡胶复合材料在AC电场作用下的瞬态介电常数解析模型
Analytical Model for the Transient Permittivity of Uncured TiO2 Whisker/Liquid Silicone Rubber Composites Under an AC Electric Field
摘要：
介电常数梯度器件的电场梯度化是提高其绝缘性能的有效途径。原位电场驱动组装是一种先进的制备具有自适应介电常数梯度的绝缘器件的方法，但是没有理论指导设计。在这项工作中，一个时间常数的分析模型，以确定未固化的复合材料下施加的AC电场的瞬态介电常数。该模型基于光学图像和介电常数监测，避免了复杂的电动力学的直接处理。对于给定组分的复合材料，填料含量的增加和电场强度的增加会加速瞬态过程。与基于微分方程的有限元法相比，该统计模型简单有效，可适用于任何低粘度的未固化复合材料，其中可能含有多种填料。更重要的是，当电压施加到未固化的复合绝缘设备，所提出的模型可以用来分析该设备的时空介电常数特性，并优化其介电常数梯度的电场分级。
英文摘要：
The electric field grading of dielectric permittivity gradient devices is an effective way of enhancing their insulation properties. The in-situ electric field-driven assembly is an advanced method for the fabrication of insulation devices with adaptive permittivity gradients, however, there is no theoretical guidance for design. In this work, an analytical model with a time constant is developed to determine the transient permittivity of uncured composites under an applied AC electric field. This model is based on optical image and dielectric permittivity monitoring, which avoids the direct processing of complex electrodynamics. For a composite with given components, the increased filler content and electric field strength can accelerate the transient process. Compared with the finite element method (FEM) based on differential equations, this statistical model is simple but efficient, and can be applied to any low-viscosity uncured composites, which may contain multiple fillers. More importantly, when a voltage is applied to an uncured composite insulating device, the proposed model can be used to analyse the spatiotemporal permittivity characteristics of this device and optimise its permittivity gradient for electric field grading.
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